A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by (A) Decreasing the size of the inlet pipe (B) Increasing the size of the inlet pipe (C) Lowering the pump position (D) Both (B) and (C)

A pump operating under specific conditions delivers insufficient
quantity of liquid. This may be set right by
(A) Decreasing the size of the inlet pipe
(B) Increasing the size of the inlet pipe
(C) Lowering the pump position
(D) Both (B) and (C)
by

1 Answer

Answer :

(D) Both (B) and (C)
by

Related questions

Delivery of insufficient quantity of liquid by a pump may be caused by (A) Air leak in the inlet (B) Low rpm (C) Too high a lift (D) All (A), (B) and (C)

Description : Delivery of insufficient quantity of liquid by a pump may be caused by (A) Air leak in the inlet (B) Low rpm (C) Too high a lift (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe. (A) Smaller than (B) Larger than (C) Same as (D) Twice

Description : Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe. (A) Smaller than (B) Larger than (C) Same as (D) Twice

Last Answer : (A) Smaller than

In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow? (A) Discharge of water by a centrifugal pump being run at a constant rpm (B) Water flow in the suction and discharge pipe of a reciprocating pump (C) Water discharge from a vertical vessel in which constant level is maintained (D) Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

Description : In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow? (A) ... level is maintained (D) Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

Last Answer : (B) Water flow in the suction and discharge pipe of a reciprocating pump

Air vessel provided in a reciprocating pump is for (A) Increasing the acceleration head (B) Making the friction in pipe uniform (C) Decreasing the acceleration head (D) None of these

Description : Air vessel provided in a reciprocating pump is for (A) Increasing the acceleration head (B) Making the friction in pipe uniform (C) Decreasing the acceleration head (D) None of these

Last Answer : (B) Making the friction in pipe uniform

An example of unsteady non uniform flow is the flow of liquid under pressure through a (A) Tapering pipe at constant flow rate (B) Tapering pipe at either decreasing or increasing flow rate (C) Long pipeline of constant diameter (D) None of these

Description : An example of unsteady non uniform flow is the flow of liquid under pressure through a (A) Tapering pipe at constant flow rate (B) Tapering pipe at either decreasing or increasing flow rate (C) Long pipeline of constant diameter (D) None of these

Last Answer : (B) Tapering pipe at either decreasing or increasing flow rate

The specific speed of a pump is defined as the speed of a unit of such a size, that it (A) Delivers unit discharge at unit head (B) Requires unit power for unit head (C) Delivers unit discharge at unit power (D) None of these

Description : The specific speed of a pump is defined as the speed of a unit of such a size, that it (A) Delivers unit discharge at unit head (B) Requires unit power for unit head (C) Delivers unit discharge at unit power (D) None of these

Last Answer : (A) Delivers unit discharge at unit head

Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will (A) Increase (B) Decrease (C) Remain same (D) Data insufficient to predict pressure drop

Description : Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will (A) Increase (B) Decrease (C) Remain same (D) Data insufficient to predict pressure drop

Last Answer : (A) Increase

In centrifugal pump installation, (A) Pump is properly primed before starting (B) The diameter of the pipe at inlet as well as at outlet, is kept smaller than the delivery pipe (C) The motor may burn out if it is started with empty delivery pipe and with open gate valve (D) All the above

Description : In centrifugal pump installation,  (A) Pump is properly primed before starting  (B) The diameter of the pipe at inlet as well as at outlet, is kept smaller than the delivery pipe  (C) The ... out if it is started with empty delivery pipe and with open gate valve  (D) All the above 

Last Answer : (D) All the above 

As the time is passing, entropy of the universe (A) Is increasing (B) Is decreasing (C) Remain constant (D) Data insufficient, can't be predicted

Description : As the time is passing, entropy of the universe (A) Is increasing (B) Is decreasing (C) Remain constant (D) Data insufficient, can't be predicted

Last Answer : (A) Is increasing

Hydraulic intensifier is used for increasing the (A) Rate of velocity of liquid supply (B) Rate of flow through delivery pipeline of a pump (C) Intensity of pressure of the liquid (D) Momentum rate through delivery pipe

Description : Hydraulic intensifier is used for increasing the (A) Rate of velocity of liquid supply (B) Rate of flow through delivery pipeline of a pump (C) Intensity of pressure of the liquid (D) Momentum rate through delivery pipe

Last Answer : (C) Intensity of pressure of the liquid

Actual lift of a pump is always less than the theoretical lift and is limited by the (A) Specific gravity & temperature of the liquid (B) Leakage & pressure decreasing at higher elevations (C) Frictional resistance through pipes, fittings & passages (D) All (A), (B) and (C)

Description : Actual lift of a pump is always less than the theoretical lift and is limited by the (A) Specific gravity & temperature of the liquid (B) Leakage & pressure decreasing at higher elevations (C) Frictional resistance through pipes, fittings & passages (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Adiabatic heating and Adiabatic cooling really means _________ and _________ respectively.  a. raising the temp and lowering the temp  b. maintaining the pressure and changing the temperature  c. decreasing the volume and increasing the pressure  d. lowering the temp and raising the temp

Description : Adiabatic heating and Adiabatic cooling really means _________ and _________ respectively.  a. raising the temp and lowering the temp  b. maintaining the pressure and changing the temperature  c. decreasing the volume and increasing the pressure  d. lowering the temp and raising the temp

Last Answer : raising the temp and lowering the temp

Conversion of dynamic velocity head into static pressure head in a centrifugal pump is the result of : (a) Increasing area of flow between adjacent vanes from inlet to outlet (b) Difference in pressure between suction and delivery ends (c) Radial thrust in pumps (d) Stuffing Box

Description : Conversion of dynamic velocity head into static pressure head in a centrifugal pump is the result of : (a) Increasing area of flow between adjacent vanes from inlet to outlet (b) Difference in pressure between suction and delivery ends (c) Radial thrust in pumps (d) Stuffing Box

Last Answer : (b) Difference in pressure between suction and delivery ends

Unsteady uniform flow is represented by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Description : Unsteady uniform flow is represented by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Last Answer : (B) Long pipe at decreasing rate

Steady non-uniform flow is exemplified by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Description : Steady non-uniform flow is exemplified by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Last Answer : (D) Expanding tube at constant rate

Unsteady non-uniform flow is represented by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Description : Unsteady non-uniform flow is represented by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Last Answer : (C) Expanding tube at increasing rate

Select the correct practical example of steady non-uniform flow. (A) Motion of water around a ship in a lake (B) Motion of river around bridge piers (C) Steadily decreasing flow through a reducing section (D) Steadily increasing flow through a pipe

Description : Select the correct practical example of steady non-uniform flow. (A) Motion of water around a ship in a lake (B) Motion of river around bridge piers (C) Steadily decreasing flow through a reducing section (D) Steadily increasing flow through a pipe

Last Answer : (C) Steadily decreasing flow through a reducing section

A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres. (A) 448 (B) 224 (C) 22.4 (D) Data insufficient; can't be computed

Description : A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres. (A) 448 (B) 224 (C) 22.4 (D) Data insufficient; can't be computed

Last Answer : (A) 448

If the driving torque, such as that produced by a diesel engine, creates pulsations when coupled with a synchronous generator operating in parallel; the generator rotor may be periodically pulled ahead or behind its normal position as it rotates. This hu A. amortisseur windings B. direct coupling C. increase governor speed droop D. decreasing governor speed droop

Description : If the driving torque, such as that produced by a diesel engine, creates pulsations when coupled with a synchronous generator operating in parallel; the generator rotor may be periodically pulled ... windings B. direct coupling C. increase governor speed droop D. decreasing governor speed droop

Last Answer : Answer: A

Pick out the wrong statement. (A) Caustic embrittlement of boiler's metallic parts is caused by highconcentration of caustic soda in boiler feed water(B) Cooling and freezing of water kills the bacteria present in it(C) With increasing boiler operating pressure of steam, the maximumallowable concentration of silica in feed water goes on decreasing(D) Dissolved oxygen content in high pressure boiler feed water should benil

Description : Pick out the wrong statement. (A) Caustic embrittlement of boiler's metallic parts is caused by highconcentration of caustic soda in boiler feed water (B) Cooling and freezing of water kills the ... goes on decreasing (D) Dissolved oxygen content in high pressure boiler feed water should be nil

Last Answer : (B) Cooling and freezing of water kills the bacteria present in it

Kilowatt load is divided between two AC generators operating in parallel by _____________. A. adjusting the governor controls B. varying the excitation voltage C. increasing both prime mover speeds simultaneously D. decreasing both prime mover speeds simultaneously

Description : Kilowatt load is divided between two AC generators operating in parallel by _____________. A. adjusting the governor controls B. varying the excitation voltage C. increasing both prime mover speeds simultaneously D. decreasing both prime mover speeds simultaneously

Last Answer : Answer: A

The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its (A) Viscosity (B) Specific volume (C) Velocity (D) None of these

Description : The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its (A) Viscosity (B) Specific volume (C) Velocity (D) None of these

Last Answer : (B) Specific volume

Rotation of crops is essential (1) For increasing the quantity of minerals. (2) For decreasing the quantity of proteins. (3) For getting different kinds of crops. (4) For increasing fertility of the soil.

Description : Rotation of crops is essential (1) For increasing the quantity of minerals. (2) For decreasing the quantity of proteins. (3) For getting different kinds of crops. (4) For increasing fertility of the soil.

Last Answer : (4) For increasing fertility of the soil. Explanation: Crop rotation is the practice of growing a series of dissimilar/different types of crops in the same area in sequenced seasons. It gives ... the replenishment of nitrogen through the use of green manure in sequence with cereals and other crops.

We are consuming a lot of electrical energy, solar energy etc Do you, therefore, conclude that energy of the universe is continuously decreasing? Explain. Which other thermodynamic quantity is continuously increasing or decreasing?

Description : We are consuming a lot of electrical energy, solar energy etc Do you, therefore, conclude that energy of the universe is continuously decreasing? Explain. Which other thermodynamic quantity is continuously increasing or decreasing?

Last Answer : Ans. No, energy of the universe remains constant (law of conservation of energy). Entropy of the universe is continuously increasing.

A reduction in the number of producers will result in equilibrium price (a) increasing and quantity increasing ; (b) increasing and quantity decreasing ; (c) decreasing and quantity increasing ; (d) decreasing and quantity decreasing

Description : A reduction in the number of producers will result in equilibrium price (a) increasing and quantity increasing ; (b) increasing and quantity decreasing ; (c) decreasing and quantity increasing ; (d) decreasing and quantity decreasing

Last Answer : (b) increasing and quantity decreasing ;

A shift outward in supply curve will result in equilibrium price (a) increasing and quantity increasing ; (b) increasing and quantity decreasing ; (c) decreasing and quantity increasing ; (d) decreasing and quantity decreasing

Description : A shift outward in supply curve will result in equilibrium price (a) increasing and quantity increasing ; (b) increasing and quantity decreasing ; (c) decreasing and quantity increasing ; (d) decreasing and quantity decreasing

Last Answer : (c) decreasing and quantity increasing ;

Rotation of crops is essential : (1) For increasing the quantity of minerals. (2) For decreasing the quantity of proteins. (3) For getting different kinds of crops. (4) For increasing fertility of the soil.

Description : Rotation of crops is essential : (1) For increasing the quantity of minerals. (2) For decreasing the quantity of proteins. (3) For getting different kinds of crops. (4) For increasing fertility of the soil.

Last Answer : For increasing fertility of the soil.

The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by (A) Increasing the gas film co-efficient(B) Increasing the liquid film co-efficient(C) Increasing the total pressure(D) Decreasing the total pressure

Description : The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by (A) Increasing the gas film co-efficient (B) Increasing the liquid film co-efficient (C) Increasing the total pressure (D) Decreasing the total pressure

Last Answer : (A) Increasing the gas film co-efficient

The critical depth in a channel can be produced (A) By raising the bottom of the channel (B) By lowering the bottom of the channel (C) By decreasing the width of the channel (D) Both (a) and (c) of above

Description : The critical depth in a channel can be produced (A) By raising the bottom of the channel (B) By lowering the bottom of the channel (C) By decreasing the width of the channel (D) Both (a) and (c) of above

Last Answer : Answer: Option D

Cavitation in a centrifugal pump can be avoided by keeping the (A) Inlet pressure high (B) Outlet pressure low (C) Inlet pressure low (D) Outlet pressure high

Description : Cavitation in a centrifugal pump can be avoided by keeping the (A) Inlet pressure high (B) Outlet pressure low (C) Inlet pressure low (D) Outlet pressure high

Last Answer : (A) Inlet pressure high

The peripheral velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec. (A) 1.8 (B) 12.4 (C) 186.2 (D) 736.4

Description : The peripheral velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec. (A) 1.8 (B) 12.4 (C) 186.2 (D) 736.4

Last Answer : (B) 12.4

Air inlet valve in water mains, is generally provided at (A) Summit of the pipe (B) Upstream of sluice valve (C) Downstream of sluice valve (D) Both (a) and (c) of above

Description : Air inlet valve in water mains, is generally provided at (A) Summit of the pipe (B) Upstream of sluice valve (C) Downstream of sluice valve (D) Both (a) and (c) of above

Last Answer : (D) Both (a) and (c) of above

Faucet A basically used as inlet pipe and Faucet B is used as outlet pipe. Faucet A and B both are opened simultaneously, all the time. When Faucet A fills the tank and Faucet B empty the tank, it will take thrice the time than when both the pipes fill the tank. When Faucet B is used for filling the tank, its efficiency remains constant. What is the ratio of efficiency of Faucet A and Faucet B respectively? a) 1:2 b) 2:1 c) 1:3 d) 3:1

Description : Faucet A basically used as inlet pipe and Faucet B is used as outlet pipe. Faucet A and B both are opened simultaneously, all the time. When Faucet A fills the tank and Faucet B empty the tank, it will take thrice the ... efficiency of Faucet A and Faucet B respectively? a) 1:2 b) 2:1 c) 1:3 d) 3:1

Last Answer : B Efficiency when both pipes used to fill = A + B And efficiency when Faucet A is used to fill and Faucet B is used to empty the tank = A-B So (A+B)/(A-B)=3/1 A/B+1/(A/B-1)=3/1 A/B+1=3(A/B-1) 3A/B-A/B=4 2A/B=4 A/B=2 Thus, the ratio of efficiency of Faucet A and B =2:1

Which of the following is not the function of a volute casing provided in a centrifugal pump? (A) To reduce the head loss in discharge (B) To increase the pump efficiency (C) To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity (D) To increase the pump discharge rate

Description : Which of the following is not the function of a volute casing provided in a centrifugal pump? (A) To reduce the head loss in discharge (B) To increase the pump efficiency (C) To collect liquid ... and to transmit it to the delivery pipe at constant velocity (D) To increase the pump discharge rate

Last Answer : Option D

If the discharge of a centrifugal pump is throttled, then its suction lift (A) Increases (B) Decreases (C) Remains unchanged (D) Data insufficient to predict

Description : If the discharge of a centrifugal pump is throttled, then its suction lift (A) Increases (B) Decreases (C) Remains unchanged (D) Data insufficient to predict

Last Answer : (A) Increases

A centrifugal pump used to pump water is used to pump an oil withspecific gravity of 0.8 at the same rate. The power consumption will now (A) Increase (B) Decrease (C) Remain same (D) Data insufficient to predict

Description : A centrifugal pump used to pump water is used to pump an oil withspecific gravity of 0.8 at the same rate. The power consumption will now (A) Increase (B) Decrease (C) Remain same (D) Data insufficient to predict

Last Answer : (B) Decrease

Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower. (A) Wetted wall (B) Bubble cap (C) Perforated tray (D) Packed

Description : Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower. (A) Wetted wall (B) Bubble cap (C) Perforated tray (D) Packed

Last Answer : (A) Wetted wall

Hydraulic pump delivers a pressure of about a) 125kg/cm2 b) 130kg/cm2 c) 140kg/cm2 d)150kg/cm2

Description : Hydraulic pump delivers a pressure of about a) 125kg/cm2 b) 130kg/cm2 c) 140kg/cm2 d)150kg/cm2

Last Answer : d)150kg/cm2

During size reduction by a jaw crusher, the energy consumed decreases with the (A) Decreasing size of product at constant size of feed (B) Decreasing machine capacity (C) Increasing size of feed at constant reduction ratio (D) None of these

Description : During size reduction by a jaw crusher, the energy consumed decreases with the (A) Decreasing size of product at constant size of feed (B) Decreasing machine capacity (C) Increasing size of feed at constant reduction ratio (D) None of these

Last Answer : (C) Increasing size of feed at constant reduction ratio

The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by (A) Raising the temperature (B) Lowering the total pressure (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by (A) Raising the temperature (B) Lowering the total pressure (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B

The increasing vapor pressure caused by heating a liquid is due to------? A. increase inter-molecular interactions B. increasing potential energy of molecules C. increasing kinetic energy of molecules (Answer) D. decreasing surface tension

Description : The increasing vapor pressure caused by heating a liquid is due to------? A. increase inter-molecular interactions B. increasing potential energy of molecules C. increasing kinetic energy of molecules (Answer) D. decreasing surface tension

Last Answer : C. increasing kinetic energy of molecules (Answer)

The sensitivity of a bubble tube can be increased by (A) Increasing the diameter of the tube (B) Decreasing the length of bubble (C) Increasing the viscosity of liquid (D) Decreasing the radius of curvature of tube

Description : The sensitivity of a bubble tube can be increased by (A) Increasing the diameter of the tube (B) Decreasing the length of bubble (C) Increasing the viscosity of liquid (D) Decreasing the radius of curvature of tube

Last Answer : (A) Increasing the diameter of the tube

A volume of air at constant barometric pressure may be brought to dew point by (A) Increasing the temperature (B) Decreasing the temperature (C) Neither (a) nor (b) (D) Both (a) and (b)

Description : A volume of air at constant barometric pressure may be brought to dew point by (A) Increasing the temperature (B) Decreasing the temperature (C) Neither (a) nor (b) (D) Both (a) and (b)

Last Answer : Answer: Option B

On some diesel-electric ships, the DC propulsion motor will only attain half speed when the generator fields are fully excited. Speeds above this are obtained by _____________. A. rotating brush alignment B. raising the generator engine speed C. lowering the generator engine speed D. decreasing excitation

Description : On some diesel-electric ships, the DC propulsion motor will only attain half speed when the generator fields are fully excited. Speeds above this are obtained by _____________. A. rotating brush ... B. raising the generator engine speed C. lowering the generator engine speed D. decreasing excitation

Last Answer : Answer: B

A filter press is (A) A batch filter (B) Not suitable, if the liquid is the main product (C) Having prohibitively high maintenance cost (D) Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure

Description : A filter press is (A) A batch filter (B) Not suitable, if the liquid is the main product (C) Having prohibitively high maintenance cost (D) Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure

Last Answer : (A) A batch filter

A levy of excise duty on consumption of an item consumed will …………….. (a) Induce suppliers to pump in more quantity in the market; (b) Result in fall in the consumption of the commodity and lower total expenditure on it by the consumer ; (c) Lead to inflationary conditions ; (d) Place the consumer on lower indifference curve

Description : A levy of excise duty on consumption of an item consumed will .. (a) Induce suppliers to pump in more quantity in the market; (b) Result in fall in the consumption of the commodity ... by the consumer ; (c) Lead to inflationary conditions ; (d) Place the consumer on lower indifference curve

Last Answer : (d) Place the consumer on lower indifference curve 

Mixing of air and fuel in the diesel engine occurs in a. injection pump b. carburetor c. engine cylinder d. inlet manifold

Description : Mixing of air and fuel in the diesel engine occurs in a. injection pump b. carburetor c. engine cylinder d. inlet manifold

Last Answer : ANSWER c. engine cylinder

A leak in the bottom of a bunker can empty the full bunker in 4 hrs. An inlet pump fills water at the rate of 3 litres a min. when the bunker is full, the inlet is opened and due to the leak, the bunker is empty in 6 hrs. How many litres does the bunker field? A) 1160 litrs B) 1610 litres C) 2160 litres D) 2610 litres

Description : A leak in the bottom of a bunker can empty the full bunker in 4 hrs. An inlet pump fills water at the rate of 3 litres a min. when the bunker is full, the inlet is opened and due to the leak, ... hrs. How many litres does the bunker field? A) 1160 litrs B) 1610 litres C) 2160 litres D) 2610 litres

Last Answer :  C Work done by the inlet in 1 hr = (1/4 – 1/6) = (3-2/12) = 1/12 Work done by the inlet in 1 min = 1/12 * 1/60 = 1/720 Volume of 1/720 part = 3 litres Volume of whole = (720 * 3 )=2160 litres.

How too tight inlet pipe lock nut make purifier noisy?

Description : How too tight inlet pipe lock nut make purifier noisy?

Last Answer : Need answer

Pick up the incorrect statement regarding a master trap from the following: (A) It is provided in between the lower end of the house drain and the street sewer (B) It is provided a cleaning eye at the top of the trap (C) The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe (D) The water seal is less than that of ordinary traps

Description : Pick up the incorrect statement regarding a master trap from the following: (A) It is provided in between the lower end of the house drain and the street sewer (B) It is provided a cleaning eye at the ... fitted at the top of the inlet pipe (D) The water seal is less than that of ordinary traps

Last Answer : (D) The water seal is less than that of ordinary traps